Definition of Iapetus in English:

Iapetus

proper noun

Astronomy
  • A satellite of Saturn, the seventeenth closest to the planet, discovered by Cassini in 1671. It has one bright icy side and one very dark side and a diameter of 907 miles (1,460 km)

Origin

Named after a Titan of Greek mythology, son of Uranus (Heaven) and Gaia (Earth).

Pronunciation:

Iapetus

/īˈapetəs//ēˈap-/